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x in (-oo:+oo)
y-8 = (-7/9)*x // - (-7/9)*x
y-((-7/9)*x)-8 = 0
(7/9)*x+y-8 = 0
7/9*x+y-8 = 0 // - y-8
7/9*x = -(y-8) // : 7/9
x = (-(y-8))/7/9
x = 9/7*(8-y)
x = 9/7*(8-y)
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